2026-04-29 12:00 UTC
- Milliseconds
- 1.777464e+12
- UTC ISO
- 2026-04-29T12:00:00.000Z
- Time zone
- UTC
Unix Timestamp Converter
Use this free Unix timestamp converter to convert UTC date-time values into Unix seconds and milliseconds or convert timestamps back to UTC ISO time.
Research-backed assumptions Formula steps Examples included Private in-browser use
Formula steps
- Read the entered date and time as UTC.
- Convert the UTC date-time to milliseconds since 1970-01-01T00:00:00Z.
- Divide milliseconds by 1,000 for Unix seconds.
How to use the unix timestamp converter
- Choose Date to timestamp when you have a UTC date and time.
- Choose Timestamp to date when you have Unix seconds or milliseconds.
- Check the unit carefully because milliseconds are 1,000 times larger than seconds.
- Use UTC for the calculation, then handle local time-zone display in the app that needs it.
Common uses
Convert a UTC date and time into Unix seconds for logs or APIs.
Convert Unix seconds or milliseconds into an ISO UTC timestamp.
Check whether a timestamp is seconds or milliseconds.
Compare date-time values without local time-zone ambiguity.
Examples
Unix seconds
UTC ISO date-time
1970-01-01T00:00:00Z
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Unix Timestamp Converter?
Use it when your task matches one of these common needs: Convert a UTC date and time into Unix seconds for logs or APIs. Convert Unix seconds or milliseconds into an ISO UTC timestamp. It works best when you already know the values, dates, units, or settings the page asks for.
What is the Unix Timestamp Converter doing with my inputs?
In plain language: Date mode counts seconds and milliseconds since 1970-01-01T00:00:00Z. Timestamp mode reverses that count back to UTC date and time. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What should I double-check before trusting the answer?
The converter uses UTC on purpose. Local time zones, daylight saving time, and application storage rules can change how a timestamp appears elsewhere. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.